Where are my installed search engine plugins located in FF21?

nor are they in (only default ff plugins are in it, not ones i downloaded)

C:\Program Files\Mozi lla Firefox\browser\searchplugins

i can't find my youtube, mycroft, torrentz search plugin in the folders (it has an extension of .xml, right?)

they are not in
C:\Program Files\Mozilla Firefox\searchplugins
nor are they in (only default ff plugins are in it, not ones i downloaded)
C:\Program Files\Mozi lla Firefox\browser\searchplugins
i can't find my youtube, mycroft, torrentz search plugin in the folders (it has an extension of .xml, right?)

Chosen solution

You can check if you have the XML files of the default search engines including Google in the browser\searchplugins folder in the Firefox program folder.

If not then you need to reinstall Firefox.

Custom installed search engines are in the searchplugins folder in the Firefox profile folder..

Try to delete the search.json file and possible search-metadata.json and search.sqlite files in the Firefox profile folder to reset the search engines to the default.

Firefox will rebuild the search.json file from the default search engines in the "browser\searchplugins" folder in the Firefox program folder and the searchplugins folder in the Firefox profile folder.

Firefox will rebuild the search.json file from the default search engines in the "browser\searchplugins" folder in the Firefox program folder and the searchplugins folder in the Firefox profile folder.

You can check if you have the XML files of the default search engines including Google in the browser\searchplugins folder in the Firefox program folder.
If not then you need to reinstall Firefox.
Custom installed search engines are in the searchplugins folder in the Firefox profile folder..
Try to delete the search.json file and possible search-metadata.json and search.sqlite files in the Firefox profile folder to reset the search engines to the default.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
Firefox will rebuild the search.json file from the default search engines in the "browser\searchplugins" folder in the Firefox program folder and the searchplugins folder in the Firefox profile folder.